Improvement in the modes of inserting diamonds in metal plates and drills



J. D. HUS BAN 08, Jr. Modes of lnserti ng Diamonds in Metal Plates andDrills.

Patented May 12, 1874.

INVENTOR.

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UNITED STATES PATENT QFFIGE.

JOSEPH D. HUSBANDS, JR, OF ST. LOUIS, MISSOURI, ASSIGNOR OF HIS RIGHT TOJOSEPH W. BRANCH, OF SAME PLACE.

IMPROVEMENT IN THE MODES 0F INSERTING DIAMONDS lN "METAL PLATES ANDDRILLS.

Specification forming part of Letters Patent No. 156,862, dated May 12,1874; application filled March 17, 1874.

graving of the seat in the metal to exactly fit them practicallyimpossible. A perfect fit of the diamond in its seat is necessary toprevent play, for if there is any play the diamond works itself from itsseat. Further, diamonds being of such irregular shapes and sizes rendersit difficult, if not impossible, to securely fit them in place, and yetto have the cutting-point project equally from either side or top, orboth. The sole thing sought to be accomplished has been the holding ofthe diamond, and to do this heretofore it has been considered necessaryto take that part of the diamond upon which the best hold could beobtained, and fit to that without reference to the cutting-edge. Theuneven projection of a diamond cuts a wider and deeper kerf, and marksthe stone so as to require much labor to make straight and smooth. Toovercome these difficulties I devised my improved mode of securing;diamonds, which consists in pressing them into the body of a metallicholder of any suitable form, while the metal is in a heated state, sothat the diamond may become embedded in the metal, and form its own.seat or cavity. I prefer to carry my invention into effect by heatingtwo pieces of metal, inserting the diamond between them, and pressingthem together on the diamond by means of a yise or other mechanicalappliance, the pieces of metal being held together by a right-andleftscrew, or by any suitable clip or holderas, for example, such asdescribed in Letters Patent No. 141,122, dated 22d July, 1873, or No.148,027, dated 3d March, 187 4. or they may be secured together bysolder, if preferred. The diamonds may be placed between the metallicpieces in such a manner as to project to the required extent for use, orthey may be completely embedded, and the metal subsequently ground awayto expose the diamond, the latter not being acted on by the grinding.Instead of removingthe surplus metal by grinding, it may be done bychipping, filing, or other means. The mode of embedding a diamond inheated metal, and subsequently removing the surplus metal by grinding,filing, chipping, or analogous means, constitutes the second part of myinvention.

. The accompanying drawings represent, by perspective views, variousmodes of applying my invention.

Figure 1 shows the inside faces of two pieces of metalopened apart afterhaving been pressed together upon the diamond. Fig. 2 shows a diamondprojecting from the end of the metal. Fig. 3 shows the diamondprojecting from the end and one side. Fig. 4 shows the diamondsprojecting from the sides. Fig. 5 shows the diamond projecting from bothtop and. sides.

In Figs. 2, 3, and 4 is shown, by dotted lines, the original size of themetallic block before having been cut down to expose the diamond.

A B are two pieces of metal, which may vary in form, as found requisite.The faces 0 C may be made to fit closely, or not, together. D is thediamond, which is seated or embedded in the metal by first heating thepieces A B,-

so as to render them soft, say to a cherry red, and then placing thediamond or diamonds between them in a proper position, and imparting anoutside pressure, so as to tightly embed the diamonds in the faces 0 O.

In Fig. 1 the faces are shown as taken asunder by separating the parts AB after pressure upon the diamond. In Figs. 2, 3, and 4 the diamond isshown respectively projecting from the end, end and one side, and oneside of the metal.

The metal may have originally had the dimensions shown by dotted lines,and been reduced to form shown by full lines by grinding or other means,so as to expose part of the diamond.

In Fig. 5 the diamond is shown as placed in a holder so constructed asto be inserted in a sawplate.

tallic holders by softening the metallic holders by heat, and thenpressing them on the diamonds.

2. The mode or process, substantially as described, of embeddingdiamonds in heated metal, and subsequently removing the surplus metal bygrinding, chipping, filing, or otheI means.

JOSEPH D. HUSBANDS, JR.

Witnesses SAML. KNIGHT, ROBERT BURNS.

